That is simply not true, the front cross member can be moved across to equalise the camber and
help centralise the front to the fixed rear. The caster is also adjustable by moving the mounting blocks around within what the hole clearances will allow. Also there is a small ammount of corrective movement possible by loosening the lower swivel mounting bolts. All of this correcting and not just checking will normally cost about £100+ as that will include an allowance for moving bits about to improve the alignment.
To the OP, one thing to consider before going down this route - change to Cupra TCA rear bushes then get it set up properly. Mostly the reason to resort to getting re-alignment done is either because of TCA rear bushes being changed or down to uneven front wheel (mostly) wear - that is where normal ride height has been roughly retained.